Apparatus for the analysis of gas.



No. 688,449. Patented Dec. 10,1901.

0. c. TUTWILEB. APPARATUS FOR THE ANALYSIS OF GAS.

A licacibn filed Aug. 3, 1900.,

(No Model.)

| H HHIIH IllllllllllI mawm u. 0

WE Noam: Prrzns co PHOTO-LITHO.. WASH UNITED STATES PATENT OFFICE.

CARRINGTON OABELL TUTWILER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TOTHE UNITED GAS IMPROVEMENT COMPANY, OF PHILA- DELPHIA, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

APPARATUS FOR THE ANALYSIS OF GAS.

$PECIFICATION forming part of Letters Patent No. 688,449, dated December10, 1901.

To all whom it may concern.-

Be it known that I, CARRINGTON OABELL TUTWILER, a citizen of theUnitedStates, residing at the city of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a new and usefulApparatus for the Analysis of Gas, of which the following is aspecification.

One object of the present invention is to provide titration apparatus bymeans of which a quantitative analysis of gases may be rapidly made.

To this and other ends hereinafter described the invention comprises theappara-' tus hereinafter explained and claimed.

The nature, characteristic features, and scope of my invention will bemore fully understood from the following description,taken in connectionwith the accompanying drawing, forming part hereof, and in which isil1ustrated in elevation apparatus embodying features of the invention.

In the drawing, 1 is a burette graduated, as at 2 and 3,for accuratelymeasuring definite quantities of gas. At the top and bottom of theburette 1 are provided three-way valves or cocks 4 and 5.

6 is a graduated vessel having communication when desired, by way of thevalve or cook 4, with the interior of the burette.

7 is a stopper or closure for the vessel 6,

a and the latter is graduated so as to indicate .its contentsvolumetrically. Another passage 8 of the cook or valve 4 is arranged tocommunicate, for example, by Way of the tube 9 with the tar-arrester 10.sists of a suitably-closed vessel filled with cotton or other fibrousmaterial and equipped with an inlet-pipe 11, extending nearly to itsbase, and with an outlet-pipe 12, extending from comparatively near itstop. I Y

13 isa mercury-leveling bulb having communication, for example, by wayof the tube 14 with one of the passages 15 of the valve or cook 5.

16 is a valve or clip for closing the tube 14.

17 is the other passage of the cook or valve 5.

18 and 19 indicate stands for the various parts of the apparatus andfrom which the Application filed August 3,1900.

The latter con- Serial No. 25,822. (No model.)

apparatus can be readily removedand on which it can be convenientlyreplaced.

the mode of operation of the apparatus reference will be made to its usefor the partial analysis of illuminating-gas and for the quantitativedetermination of the sulfureted hydrogen present in it by using iodin asthe tit'rating solution and starch as an indicator. .The stop-cocks orvalves 4 and 5 are so positioned that the passages 8 and 15 communicatewith the interior of the burette 1, the rubber tube being removed from15. The gas to be tested after traversing the tar-arrester 10 ispermitted to flow, for example, by Way of the tube 9 through the burette1 and to escape, for example, at 15, so as to displace the air in theburette by the gas to be tested, in the present instance, for sulfuretedhydrogen. The valve 5 is then positioned to close the burette 1 at itsbase and to permit 15 to communicate with 17 for a purposeto bepresently described, and'the valve 4 is positioned to close the top ofthe burette, and the tube ette 1 is then filled with gas, which may beallowed to stand until its temperature corre-- sponds with that of thesurrounding atmosphere, and the latter may of course be noted. Themercury-leveling bulb 13 is then made to communicate with the passage15, for exing-bulb is lifted until mercury appears at the opening 17. Inthis way the passages are cleared of air. The valve 5 is then positionedin such a way that mercury passes it and enters the burette, thuscompressing the gas until the mercury reaches the graduation 2. Thevalve 5 is then positioned to close the burette, and the valve 4 ispositioned to momentarily permitthe interior of the burette tocommunicate by Way of 8 with the atmosphere in order to bring the gas inthe burette to atmospheric pressure, it be ing understood that the tube9 is disconnected for this purpose. The valve 5 is then po= 'sitioned topermit the interior of the burette to communicate with the mercury-bulb13,

and the latter is lowered until the mercury is For the sake of clearnessof description of I 9 and gas-supply are disconnected. The burample, byway of the tube 14, and the leveldrawn back to the stop-cock 5. Thevalve 4: is of course closed during this operation, and upon itscompletion the valve 5 is positioned to close the burette and to bringthe passage 15 into communication with the passage 17. The result ofthis is that the burette contains a definite volume of gas measured atatmospheric pressure and under a negative pressure or in a somewhatattenuated condition. The clip 16 is caused to prevent the furtherpassage of mercury, and the tube 14 is disconnected. The tubes 9 and 14having been disconnected from it, as described, the burette is thusisolated from the leveling-bulb and the tar-arrester and is then takenfrom its stand and there is drawn into it, for example, through 8, sometest solution, which in the present instance comprises a solution ofstarch. This may be done by dipping the part 8 into such a solution andmanipulating the valve t to establish and disestablish communicationwith the interior of the burette by way of the part 8. The vessel 6 isthen filled with a standard solution, which in the present instanceconsists of a solution of iodin. By manipulating the valve 4 smallquantities of the standard iodin solution are admitted into the burette,which is shaken between each addition of three or four drops of thestandard solution, and this operation is continued until the starchsolution assumes a permanent blue color. Reference to the scale upon thevessel 6 shows the quantity of the standard solution introduced into theburette. The quantity so introduced is proportional to the quantity ofsulfureted hydrogen contained in the burette, or, in other words, in themeasured volume of gas which it contains. Consequently the vessel 6 maybe graduated so as to show the amount of sulfureted hydrogen containedin the vol ume of gas inclosed in the burette. In this way the readingsare direct and the determination is exceedingly rapid. The iodin reactswhen the sulfureted hydrogen producing hydrogen iodid and the starchsolution indicates the presence of uncombined iodin. This react-ion isof course Well understood and is so set forth merely for the sake of aclear explanatiom g I I It will be obvious to those skilled in the artto which my invention appertains that modifications may be made indetails without departing from the spirit thereof. Hence I do not limitmyself to the precise construction and arrangement of parts hereinaboveset forth, and illustrated in the drawings; but,

Having thus described the nature and objects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

Apparatus for use in the analysis of gas mixtures, comprising incombination, a tararrester, a graduated burette, a stopper-ed graduatedvessel arranged to drop its contents int-o the top of the burette, meansfor establishing and disestablishing communication between the top ofthe burette and the tar-arrester and the atmosphere, and between themeasuring vessel and the burette, a mercury-leveling bulb, and means forcontrolling communication between the base of the burette and theleveling-bulb and between the bulb and the atmosphere, substantially asdescribed.

In testimony whereoflhavehereunto signed my name.

CARRINGTON CABELL 'lUTWlLER. In presence of-- W. J. JACKSON, K. M.GILLIGAN.

